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Hey, anyone interested in giving me some feedback on a 3.5 dungeon I made? This one is going to be a volcano / nuclear reactor on the Ethereal plane, created by the Steel Dragon Eutectus, who at this point is basically a level 20 dragon // 20 sorcerer gestalt. Thoughts on appropriate encounters for the Under-Island? CL?
Costs: Genesis, 2 scrolls * 28825 (same as scroll of Wish). Sigil of Antimagic (forming a cylinder from the coterminus point to the lava) * 66000.
When you talk about the under-island, I imagine a world on the inside of the core in a non-Euclidean arrangement (though the over-island would have to be much larger for it to make sense, I think). Your "apple with the equator eaten and replaced with water" diagram makes things clearer, though it makes me wonder what (beyond standard gaining altitude for easier recon) would cause a character to fly through the demiplane boundary.
With overland flight at a "walking" pace of 40' per round, a traveler can cross the water sections you describe in under a minute. Even a swimmer can cross the distance in a relatively short amount of time. The pouring rain around the equator would do little to impede the vision of any character with a natural swim speed, such as an aventi.
Yeah there are some limits to genesis that are kind of inconvenient. I could cast it a bit more, but I don't really want to spend XP on it, and the scrolls are the same price as scrolls of Wish.
I could make the water area coterminus to the Elemental Plane of Water, or just to a convenient Prime ocean somewhere, but again, I don't really want random people wandering in to my dragon's lair (hence the lava trap). I could also make the lava coterminus to the Plane of Fire. Maybe I should have two of these, an open one and a closed one xD
A swimmer who traveled for a minute or two would hit the demiplane boundary and then wrap around to the other side of the equator; coming through the glowing, misty, rainy boundary he'd see the island in front of him. The boundary is a hard line of sight blocker; even if rain and water don't impede your vision, or you have blindsight to 1000 feet or something, you can't see past the planar boundary. Light is reflected, and most other emissions are converted to light and reflected. Even if you shot x-rays at it, it would read like a solid wall, due to the nature of entropy at the boundary region.
As for what would make someone fly upwards, that's really not Eutectus's problem. His lair is intentionally hard to find. There -are- divination spells that would give the party hints, though. Flying through the equator boundary horizontally would be a hint. If I was doing this as a dungeon, I could even say the boundary is shaped like a mobius strip; leaving the boundary on the equator of Over-island puts you on the boundary for Under-Island and vice-versa (not really how I want the island to be set up, though).
Actually...That character has now acquired the services of five solars for 17 days (he only needed 30 wishes, but I figured he might as well make use of the full package). They could easily memorize the cleric version of Genesis and give him a proper domain.